Engelbert & Gene...same person or separated at birth?

So I'm flipping through The Dallas Morning News weekend guide and there's an ad for a casino in Oklahoma that's about an hour drive to the north. The ad has photos of the different acts coming to the casino in the next couple of weeks and I notice that Gene Simmons is coming. Only it's not Gene Simmons. It's Engelbert Humperdinck. He's coming to the casino. But he really looks like Gene Simmons in the photo that ran. I did a quick search of Google images and the resemblance is uncanny: